exam Maths Puzzle Numerical Ability

please help me simplify ( 2+3i ) ( 2 - 3i )

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exam Other Question

A lift can carry 6 more people than a lift B.
a): by letting the number of people that B can carry be x state the number of people that A can Carry
B): When B makes 5 journeys it
graph equation

y=34x+2